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Growing Cosmos From Seeds Indoors – Here’s How To Do It


Half-hardy annuals grow, flower, set seed and die all in one year, but unlike hardy annuals, they can’t tolerate low temperatures. They’re easy to grow from seed, flowers in as little as 12 weeks, and can be added to borders and pots in just a few days.

They can also be grown from cuttings, which means you don’t have to worry about overwatering your plants. You can even grow them indoors, as long as you keep them in a cool, dark, well-ventilated area.

Everything is explained in that video:

How long does it take for cosmos to bloom from seed?

Cosmos will bloom in just under 3 months from the date you plant them, they’re perfect for beginning gardeners. If you want to get a jump start on the season, seeds can be sown directly into garden beds once the weather warms up.

Is it hard to grow cosmos from seed?

No, it’s not! Cosmos is one of the easiest flowers to grow from seed that is directly sown in the garden bed. After all the danger of frost has passed in late spring or early summer, be sure to scatter seeds. The best way to care for a Cosmos plant is to keep it in a well-drained soil with good drainage.

Cosmos will tolerate a wide range of soil types, but it is best to use a mixture of organic and inorganic materials, such as sand, peat moss, and compost. It is also important to water Cosmos regularly to prevent root rot, which can cause the plant to wilt and die.

Why are my cosmos seedlings leggy?

It could be that the window you are growing your seedlings in does not provide enough light, or it could be that the lights you are using as grow lights aren’t close enough to the seedling. As they grow, the seedlings will get smaller and smaller.

If you want to grow your seeds indoors, you will need to use a grow light that is at least 10 watts per square foot (W/m2) or more. If you don’t have access to one of these types of lights, then you can still grow them outdoors, but it will be a lot more difficult and time-consuming.

You will also need a growing medium that will allow the seeds to germinate. The best medium for this is peat moss, which can be found at your local garden center or at a garden supply store. This medium can also be used as a substrate for your plants, so it’s a good idea to have some on hand as well.

Can you bury leggy cosmos seedlings?

Generally, yes, you can plant leggy seedlings deeper in the soil to help compensate for the extra-long stems!. When they’re still very young and tender, don’t plant them deeper right away. When you’re ready to transplant the stems to a larger pot, you’ll have to dig them out again, because they may rot after being buried in soil.

If you do decide to do so, make sure you plant the seedling in a well-drained pot with good drainage, so that the roots don’t dry out and rot. You can also use a potting mix that has a good amount of organic matter in it, such as peat moss or vermiculite. This will help keep the root system healthy and prevent it from drying out, which can lead to root rot and other problems later on.

How do I make my cosmos bushy?

As you plant the Cosmos plants into the garden it is advisable to pinch out the growing tip of each stem. Pinching out involves removing the tip between your thumb and finger. This will encourage the plant to grow side shoots, which will give it a more uniform appearance. Once you have pinched out all the stems, you will need to remove the leaves from the plants.

You can do this by pulling them off with a pair of tweezers or with your fingers. The leaves will fall off as you remove them. If you don’t want to pull off the leaf, then you can leave it on the stem for a few days to allow it to dry out before removing it.

Does cosmos come back every year?

Most of cosmos plants don’t come back every year. You will need to replant the seeds in order to have blooms every year.

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